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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e67cdcce2284bc320a988d3ac4cbbf3b3937620ffcecae86535c66992548f9f1' 
  AND token = 'T1B8WoO784uM8J8hIzykBw69VDH22vLUXl/3E/zIowQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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