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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eaad795fcf8a25d1971ad2b269d744a2916c6ccaa796b23cdee9a86c4319f4b3' 
  AND token = '7xvnC1R8QHXMh1dXBbmtCc3+mjaWBf5l2+jaFaRqqQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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