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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd698f0bba0f55792443dcd4dfcf3843ff5a5284c330a252aa40a948ec09e4760' 
  AND token = '9q74PZmpxZ6W04x3pOe3J3x/K5Rw8NxQEPl+ksUTa04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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