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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cbea02447c16a4e35b7d5156c78893d94bc038bc9ec9dd245a7d92e12610f59' 
  AND token = '1mS40vq31N7B/f+AH3xuo74vBgdP9/KBeNvollnaOFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}