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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a498f4694ff849b800fd974d1b25c3c0f26e8a7b493517dccdc3edcf1b15a8ea' 
  AND token = 'px2V+ae7XKvQ+q33gGIj7MR6MUp0ekeUf4hMthd/iAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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