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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80a12766c32bba2d783126d7f44bb25efc463afe360fdb8c426afa2a5326f811' 
  AND token = 'MqkV0oJLfSF0S8bhV7/GrHG5LJ4xUhHTi1t8zl/O7f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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