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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9344c2905d5a9200c4c2534cdc6c05d63a3f030e7d3634457a0fb0cf6b8781c6' 
  AND token = 'DHwvyqzW6GeJ8yH9CrjriagWjQ6xky9Xg6WrvWNqXrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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