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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4dd5a223f041ef42808b72845d5947ed39cbdbee4e4d95f7c8a7890e4c4f8eaa' 
  AND token = 'w6hRUgUKSt5hvlzdvNz/8YOBhXoaD14rODsotarmSIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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