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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6a5ac2a4085b2bfbaf332bb618325c45aba180e138b08ffb4d85d7018f9d04d' 
  AND token = 'hI0km8LbYnRW676uFyNQUUJ4Y9ndPqLGQq73x+DfdG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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