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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b9dfe2b567d4161cdcfc226b75447eabddc2ff76d5936922b767de5f2f96454' 
  AND token = 'QU+IEl907wiFMtxRKn4qDunrQk3ou5gJ5ITB03DbIOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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