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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae338b820169eb8da6035fe4c2eb46e8141b204933e5ad150b975f288673fdb1' 
  AND token = '9EtsY2cl+84EOXf765oNX3MbN90jjS69CGIOat6svQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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