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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4b58052d1294201c68e761203012f5b16f1423cb7e4facb0ea7560c0083ba09' 
  AND token = 'wsslZAkFqskrDUq1y1GXwlUjCHEtRoVpGWgPOd5iHZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00273

JSON explain

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