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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '802e676af9351b1d255450a00e6f1d6d00cfdd21bfeb9cd48a808205d7ace670' 
  AND token = 'QVo+MLVLetH1FIZu6oX6P6fZ+Zq3HmNj7fbOu6h8qBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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