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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcf65f774425713e32014469da99db5733c0f265922c60e2fa3af993137e027f' 
  AND token = 'jTVE+SxT2htHkFxq9Jaok3+wm4c1QK0Ou7v47vtgtfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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