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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52947e4b9397a81ec937f56b163eb0521b1ee430fd009a512effbe6e680ccfa2' 
  AND token = 'wZ7sPyKH+qtXPjDNQh2irr5S3auSUijOag+/0TS1UHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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