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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ab9011150bbd903dc5b1f3c28892b8b1e89ad3f3bb052a19facdebaa1d3585c' 
  AND token = 'UkMZ1O/03a071aaEQTintcsLGVgeOa/u5l5CeNQjdk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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