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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b51a08472c57748977035d1f1bb7b84725990bfd44080a60afaaa9c544effbd' 
  AND token = 'ksZu6GgiQruMfifDv/n0E6ZsMOHCQIlUM8xdeDeDOJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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