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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '240c89bc2cf4f3d0ac410fdd1c605d419694ae3c05e4d6aa9503032b194ee0bb' 
  AND token = '/ni9yGRQ5n4Jh8EgDiREjIDcG4pGPxfiW20U0J9Vwig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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