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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '582701e71171d80976d7a950c840c5744fb729aafc9fd9adfb9da9bde428540d' 
  AND token = 'JdFqsfjyc22BmGteK/RBECHsXT1bpTD29SOFye1wKdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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