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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43b9679f383b4c8dbe0263de278fe0b613a9b4de695ee476e7f8f09bc82fd5c5' 
  AND token = 'c3JTqto4H3QQHMq8NYYK7dLZkHDlTfQ90257gBorsQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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