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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f46702dfbe7a8f09e613b267922f3a9688e368ce1415ad1c0055ea9b869ba032' 
  AND token = 'S3Ix4G+Nr5QhXtBCRSExMWfjk3QOP78M8xhKtHn8pLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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