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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '660c095e9482512f55b2895602ffd7caf647b2473fd5ae834a3af049b69f1666' 
  AND token = 'iLgjKaQW1j1M1Vz1A+0OjRzODG3CksGFc+W5S59AmM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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