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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b10a7d63dc6f75e6b596a29476bdd7e8ad80eee4831e4dc06011c1ab4a05c711' 
  AND token = 'bueX4WBS76Orgy8S6jFXwZW+K3TQzAUxsEu7Bd9d/fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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