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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c4da5e8733a3818b5c8c2a684762c190d24ed2d3933b100cb5cc79b85e00736' 
  AND token = 'zK/9mtTna1zlnE4mWwR6TKDDO6GRNzvGGxBxDPzIDWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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