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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b29842ab3a12df852e4cf47c75347d52267db88fec8b9e07cc098f5f42b46e7c' 
  AND token = 'BeKoqFInlDcIjfswyIiUl5Jc6yzt9GdeiSqfoWTfkm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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