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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c86a3f3112375c49f4848632de1038818f8a381960ddfae6d3080c5dbdea6a7' 
  AND token = 'iPF/2RCxJcsujyzIepfIMW10YYoNy5gkKxcQVsAGxyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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