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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3efe40a58314fa84957c8e5915337d54018c1eb2583f225bd3d5e1e809418d1' 
  AND token = 'o8FzW6oAPkOx+RBAGRxNVKDSjcN2eXh6DviK6nenq00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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