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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c5632b987735384e7239d146d6792aebb168db5a74755298d1ff9918ed6d160' 
  AND token = 'xC4jX6U6GUnB+DVqt+X2WTLeHa2Y3MiOrUrrrkOSkF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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