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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f8cd130d5ebab886acfa61d91ff9fcb5ee0b73957b0b7334c992dd0a9f06af5' 
  AND token = 'ZuKz8Efof2c3Pw7ljnjP9ak6lxY8t+M9GAkHw7aw3UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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