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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '156c051cf963176f1ee594d8a9c12503ba63d4c84a2ef2e9210b9de41a68ca5c' 
  AND token = 'V83e1Bp0OcTKw7aoBxCwwKOcxmdaWj3byFImczJ6ye4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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