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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0ecff6fd4830d0fe7bc3286b9c3c1282a9dec4564c2fb019995dc970683b329' 
  AND token = 'ihpJKV80PsPy2MPKbKqUo4bskFdXw0lEsxNQ6V7Ryhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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