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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22af51f0517bd8556a0d1fdf934b994119c78422376b796074e8dcd2294ca57c' 
  AND token = 'ogXF+n5uPD5cnviFL0eW52d8WPznUk+vkx0WkOecoHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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