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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd926b26a685ade273a1e1dfb429dbbeaa2e60285e8742c343ba0f431444a4205' 
  AND token = 'qwbkNW7cdCAjVRoO7kPJyS49xWHt9nxJUVfN68IzUzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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