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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dce243b7d58b9b1f6227633b416be19f4418e65c61157e6d542cc00b119c8394' 
  AND token = 'iLj7j3R8EZid+5Q3j1Tmr8X4eXhi/oxoaZCnZHkjnyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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