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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47a7f21730518dc6e0025b5574015f97fd88f2c6ea8178983687bbcdd84c8ba3' 
  AND token = 'NIGnBkyH37Qe1t7D0Q1N/oSs2edTv0ynVxoREGTRe3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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