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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b1667b9d8c4127db84a82004e84a16ee5546771747c689e6e00572d410ae1c2' 
  AND token = 'XzOA/dokeSbsWTccTyNlR7ZOtAI7PgsuVLXvJS8gk2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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