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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ddff2a45647c231b2ab2aacf6485c47c528aaabf08eac49c86f59e63e5cd237' 
  AND token = 'ExWQXQMx7Bz9i8j/Ewf2PagNnQ6eQciEMlNhjxK5ElA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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