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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '557447c1f40649c62eaf168922e0193b48ace4011b6691a475f3e6216ece6436' 
  AND token = '9tBPD7j3ht+hj7wuYchzxIg6fm7j+tfca584iIwEizY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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