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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bbbb453f1cb6a01863d77d24653b3138b6a0315e6fdfd4d3a07e1be7c8a0707' 
  AND token = 'GktemHzUxKSPXjPx/LpufI56lVeXo0VV+l6tiazMBc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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