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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61c39ef80b95d18cbdf9c707c4dad93418dce1f1f18d09fa41ea020dec9ec6d5' 
  AND token = 'qn2awfQsZUElh8/qv77n59BdHTlaHLTMCh39KbCJapI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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