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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bced5c47b9fa683ad99118745e46014266cdfae50038129c55004e09a4b3a607' 
  AND token = '3G8im0KHZ1tl/NcCmeEp698Y4Htk30GhVLZNQSU4bQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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