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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aaf505f469e6ebfaeee7d5f922806cc2984d961a3da247433c3fefb22d1869a' 
  AND token = 'zmkdu/5XvSJC/UDpuQG2zcDvvY4T5b47FPKE8/kRck0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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