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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8eeea11c450ab54030cd66891a530e71f9b903f156563c399c824295ccdc497' 
  AND token = 'o9pvexnDOhw0cjikpIC1QqwVZ7XMS/yumfBYEIkcMSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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