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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '404c1385fbf38f91755a404f9b41922e99cde695c35671dbc68f0cc6e893eeda' 
  AND token = 'sVY74HJZnPj5HddM/0tHP1O6tyOWK17n3EJ1eefM97A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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