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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da211ba9766abd61d80e8dbea9744e288aac65303ec7c78da4e5d47081c1950c' 
  AND token = 'SpGgXpIizuaIbvkuzRNy88BsbspIWbJAWur7ade70RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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