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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a92871ec1f75506aa4c4480aad554543776303f509af98779f8883d2e5892ee' 
  AND token = 'gjfwIbdLv6qQfkf71q5xHTdOW7D8pAnXh1h0rsz0r+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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