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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbc0c3104a965369bf3437edbd6dfc32d2ea7dedf8ec0cc562f64df34e542797' 
  AND token = 'tzUJcIW/UR0B2ehVNi2ZohziQ7J+NfHbipPUKXoVl2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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