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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff2b9217cc340ec23896147392396214a9432cc1dd7a51d9bc6568b5012ad915' 
  AND token = 'bnciSXFzHOT42lQOq7cN7NMrUhrQNvJLF2n7v5n1y/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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