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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '632d7a8ec57696db7deb674a477eac4ee2116efc066eb0768bb27e12e858891f' 
  AND token = '3n/B1JuYQss8pKBG37H7H36M6fWNqSzBCk2rfLFKHsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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