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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c89f1f2c9c3e4638ff3b18b15130d7457417740c48ea126465ec2257ab246c3' 
  AND token = 'pUQdgMqQJ8ivT7ifBao3LN0aiWbr2/pFB4RaVaR4ytc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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