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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76ccff68683ebb91f3bedef153ce1bb13124c27164ad0a9cc3f458a62611493e' 
  AND token = 'LqkrWBrStbTvJLy731WbuseRBnzNcL1oyh/uiionBE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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