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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b201f280547441a44edc4d4ba41a9c438abe65aa6559fd74ecc916a235cb09d9' 
  AND token = '4RVS49IHir7SNjLJfup4C0P9l7K9RmtEYJs3K6zRS8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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