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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c644af7747ebae1b2e9f932ef8f94b063cc34cb355abf6b86839617b178e23b0' 
  AND token = 'kkTd/T20/ZAoWXNS36DyKLZ9kFkJnXqBv37JMR2jUbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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