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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65773d940b8024876469b634b6ec632404e443d51da83dfc31386b9a64d84b5a' 
  AND token = 'kCkd3R1OwPhh8P8MkqAN8cqwL2IPaFUcnb5eXFqAnyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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