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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97a512fe8448e99df65d379c594da6e3ba3b39bd4d0744d8f1b7aea17453c317' 
  AND token = 'EAuplFc9UDWBV6i3MkaMQjWcETBZSOP53uEPyNrKqVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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