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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4d2bbadbcf5d97456d042858f66fdace2cb4d832887b2f6b2cea7f99d798e13' 
  AND token = 'VXC70ke47ff7pbXmcsoZgdjl+lrLQY0sKyJpG1cmWg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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