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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e8f35995eb8bad9dff13a98dbf5948a36bdb921862035ff730ee9f3fbe6159c' 
  AND token = '6+a1c6SrZbNLK47V5dJVA2Ux8TdUnwlMwya/QQU601o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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