SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '461fc8bc147323240974167c0910985e5486d221bfe150f516500a9abde29836' 
  AND token = 'LojugnRPQRsJS8f1Fb9cFGVkAUQWbq1THeuZS+pr3Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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