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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '102167e0eb9e8bc05d3565ceaba4dc6cc580a83de4171850919495feaf3c783a' 
  AND token = 'SM5N10VHj1QICT2F5JWVOgXY+OOdy77NBCQ4IpN2dpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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