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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63b553cef015e5a93535a441690b0bd7104017cd720374da8e85aff858e94d38' 
  AND token = '+xQ6GlipNgnOz1PsQ746qWrWIkNHRx5OkFX1s+LL6OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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